#include<stdio.h>
int main()
{
	int year;
	scanf("%d",&year);
	if(year%4==0&&year%100!=0||year%400==0)
	{
		printf("%d年是闰年\n",year);
	}
	else
	{
		printf("%d年不是闰年\n",year);
	}
	
	
	return 0;
}